<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>align-content</title>
    <style type="text/css">
        .box{
            display: flex;
            flex-flow: wrap;
            height: 160px;
            width: 160px;
            border-radius: 5px;
            background-color: #eee;
        }
        .box div{
            margin: 5px;
            padding: 10px;
            border-radius: 5px;
            background-color: #aaa;
            text-align:center;
        }
        #div1{align-content: flex-start;}
        #div2{align-content: flex-end;}
        #div3{align-content: center;}
        #div4{align-content: space-between;}
        #div5{align-content: space-around;}
        #div6{align-content: stretch;}
    </style>
</head>
<body>
<h2>flex-start</h2>
<div class="box" id="div1">
    <div>1</div>
    <div>2</div>
    <div>3</div>
    <div>4</div>
    <div>5</div>
</div>
<h2>flex-end</h2>
<div class="box" id="div2">
    <div>1</div>
    <div>2</div>
    <div>3</div>
    <div>4</div>
    <div>5</div>
</div>
<h2>center</h2>
<div class="box" id="div3">
    <div>1</div>
    <div>2</div>
    <div>3</div>
    <div>4</div>
    <div>5</div>
</div>
<h2>space-between</h2>
<div class="box" id="div4">
    <div>1</div>
    <div>2</div>
    <div>3</div>
    <div>4</div>
    <div>5</div>
</div>
<h2>space-around</h2>
<div class="box" id="div5">
    <div>1</div>
    <div>2</div>
    <div>3</div>
    <div>4</div>
    <div>5</div>
</div>
<h2>stretch</h2>
<div class="box" id="div6">
    <div>1</div>
    <div>2</div>
    <div>3</div>
    <div>4</div>
    <div>5</div>
</div>
</body>
</html>